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DataSource

public interface DataSource
implements CommonDataSource, Wrapper

javax.sql.DataSource


A factory for connections to the physical data source that this DataSource object represents. An alternative to the DriverManager facility, a DataSource object is the preferred means of getting a connection. An object that implements the DataSource interface will typically be registered with a naming service based on the JavaTM Naming and Directory (JNDI) API.

The DataSource interface is implemented by a driver vendor. There are three types of implementations:

  1. Basic implementation -- produces a standard Connection object
  2. Connection pooling implementation -- produces a Connection object that will automatically participate in connection pooling. This implementation works with a middle-tier connection pooling manager.
  3. Distributed transaction implementation -- produces a Connection object that may be used for distributed transactions and almost always participates in connection pooling. This implementation works with a middle-tier transaction manager and almost always with a connection pooling manager.

A DataSource object has properties that can be modified when necessary. For example, if the data source is moved to a different server, the property for the server can be changed. The benefit is that because the data source's properties can be changed, any code accessing that data source does not need to be changed.

A driver that is accessed via a DataSource object does not register itself with the DriverManager. Rather, a DataSource object is retrieved though a lookup operation and then used to create a Connection object. With a basic implementation, the connection obtained through a DataSource object is identical to a connection obtained through the DriverManager facility.

Summary

Public methods

abstract Connection getConnection()

Attempts to establish a connection with the data source that this DataSource object represents.

abstract Connection getConnection(String username, String password)

Attempts to establish a connection with the data source that this DataSource object represents.

Inherited methods

From interface javax.sql.CommonDataSource
From interface java.sql.Wrapper

Public methods

getConnection

Added in API level 1
Connection getConnection ()

Attempts to establish a connection with the data source that this DataSource object represents.

Returns
Connection a connection to the data source
Throws
SQLException if a database access error occurs

getConnection

Added in API level 1
Connection getConnection (String username, 
                String password)

Attempts to establish a connection with the data source that this DataSource object represents.

Parameters
username String: the database user on whose behalf the connection is being made
password String: the user's password
Returns
Connection a connection to the data source
Throws
SQLException if a database access error occurs
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